EM300 with hourly measurements keeps sending empty payload.

[emwfsv]

We have a thousands of units thats been configured to have an hourly measurement.

But the sensors keeps sending blank payloads 2 times every hour, and the measurement once an hour.
Measurements are sent on Port 85 as described in documentation.
However the blank payloads are sent on application port 0 and is nowhere to be found in documentation.

We are considered that this will cost battery lifetime.

• Why is the sensor sending these empty payloads?
• Will it cost battery lifetime?
• If so, How is that turned off?

We do not see this type of behavior on other provider of sensors or in EM500.

[danak6jq]

Blank/empty payloads on port 0 are used by the LoRaWAN protocol itself to send MAC commands in the frame header, such as LinkCheckRequest . I suggest examining the frame header of these uplinks to see what they contain.

I recall that MileSight IoT uses LinkCheckRequest to validate LNS availability when Re-Join mode is enabled. See section 3.2 of the EM-300 user guide: